S2R 800 Brakes and 749S forks...not working together, happily in harmony...

[yosso]

if you're bottom caliper bolts were closer in than your top bolts, it leads me to think that maybe your wheel spacers or axle are about 4 mm short of what they should be (two mm on each, seems to match your measurements right?)... if your axle lips and spacers aren't adding up to what the correct spacing should be, when you torque down your axle nut, you are bending the bottoms of the forks closer together a bit...

this is all theoretical.

i have an s2r800 with 999 forks and stock brakes.
5mm spacers on the calipers.
no spacers on rotors.
i used stock s2r800 axle for now, because the 999 axle was not the right fit.

what axle are you using?

also, i have a stock s2r800 top triple, silver. pm me to discuss.

I'm using the stock axle, which already had the holes for the bottom adjusters. 

Now I'm just going to get a stock top triple and get the bike back on the road with the stock forks and hopefully the S2R800 rotors and calipers.

I may or may not send the SBK forks off for repair.   

woah.

ok so the triples are off.

makes more sense now.

Yep, the whole endeavor was doomed from the start.   

Now, I think I can start over with good parts and the stock forks and just be happy 'til next year.

Mike

[Raux]

who bored your upper triple? I would have a chat with him about the work

[Speeddog]

FYI, on the S2R800 calipers, the caliper itself floats side-to-side on the bracket, as the inside pads are 'fixed' to the caliper.

So it's going to be difficult to figure out what spacers you need by measuring with those S2R800 calipers.

[yosso]

FYI, on the S2R800 calipers, the caliper itself floats side-to-side on the bracket, as the inside pads are 'fixed' to the caliper.

So it's going to be difficult to figure out what spacers you need by measuring with those S2R800 calipers.

Well, once I get everything aligned...it should be a little less painful.  I've got a bag full of 0.3mm, 0.5mm and 1.0mm thick shims (sourced from McMaster Carr), so hopefully I'll be able find something that will will place the calipers in the center position on the sliders on both sides.

First, I need a new top triple and some straight forks.   

The top triple is being shipped (sourced from ebay) and the forks are being sent to Frame Straight. 

I'll report back on how the brakes fit on the stock M750 forks once I get the new triple.

[yosso]

who bored your upper triple? I would have a chat with him about the work

A local guy, I tried to save on shipping.   

It cost me $150.00 to have the top triple bored and fubared.

Did I pay too much? 

[corey]

i'm wondering, is the fact that his setup is on an older 750 with the smaller head/stem creating the differences between his setup and mine? it was really simple for me... the calipers were too far from the rotors, and 5mm was the difference in rotor offset between my bike and the 999 from which the forks came. thus, 5mm caliper spacers.

i guess obviously the wheel is different, the axle is probably different (solid axle, older mosnter right?), stem/headstock is different... i guess there's a whole host of variables...

[yosso]

i'm wondering, is the fact that his setup is on an older 750 with the smaller head/stem creating the differences between his setup and mine? it was really simple for me... the calipers were too far from the rotors, and 5mm was the difference in rotor offset between my bike and the 999 from which the forks came. thus, 5mm caliper spacers.

i guess obviously the wheel is different, the axle is probably different (solid axle, older mosnter right?), stem/headstock is different... i guess there's a whole host of variables...

I've got a hollow axle and it's even got the  holes drilled for the lower adjustment.   

I _think_ my problems were due to the mounting ear on one fork being slightly bent, and I'm sure the non-concentric upper triple on the right side didn't help matters.  The "new2me" stock triple should be in hand sometime next week.  I should be able to get it back on the road (with the stock Showa non-adjustable forks) over the 3-day weekend.

[corey]

FYI, on the S2R800 calipers, the caliper itself floats side-to-side on the bracket, as the inside pads are 'fixed' to the caliper.

So it's going to be difficult to figure out what spacers you need by measuring with those S2R800 calipers.

Sorry for the Zombie Thread... but i caught this comment during a search for some general info, and wanted to ask something...

I'm not understand why it would be difficult to figure out spacers???
I understand that the caliper floats horizontally, but the mounting points do not, correct? The caliper is supposed to float, so as long as the caliper MOUNTING POINTS are at the same distance from the rotor as they were with stock forks, the calipers floating RANGE would also be in the same position as the stock forks, right?

So in this particular case, because the 999 rotors are 15mm offset vs. the 10mm offset on the S2R or M620, there is a 5mm gap between where the caliper mounting point is supposed to be, and where the caliper mounting point on the new 999 forks is physically located. Fill this gap with a 5mm spacer, and your caliper mounting point is now solidly in the same location as stock in relation the rotor, as is the floating range of the caliper itself...

Am i right in this analysis?

[ajw85]

A local guy, I tried to save on shipping.   

It cost me $150.00 to have the top triple bored and fubared.

Did I pay too much? 

I paid about $150 for machining labor & material for spacers

[corey]

Okay, so now that I know I'm wrong, and that the 300mm rotors on the S2R800 have ZERO offset, why do my brakes work? Or is the only thing that is letting them work the fact the caliper IS floating?
Do the calipers actually float 10 WHOLE MILLIMETERS? I'm thinking no way in hell.
Would different offset in the 999 TRIPLE CLAMPS (i.e. distance between forks) come into effect?

EDIT:
That was stupid... If the forks were a different width apart, then the fender wouldn't fit now would it.

EDIT:
I have learned that the 999 FORKS have 5mm more offset than other Ducati forks. Is this correct?
This would cut my offset issue down to 10mm on each side. With my spacers in place, that cuts it down to 5mm each side.

I have also learned that the 999 WHEEL is wider... if the wheel itself is ~10mm wider, this would put my spacers in the right area...

Anyone with any insights into this?

Argh. Now I'm all nervous n shit.

EDIT:
Excuse this rambling thought process...
I think I figured this out though.
Considering the S2R800 300mm rotors have zero offset, and that 320mm (with 10mm offset) rotors from say, an S2R1000 would bolt right on with gold-line calipers, that clearly indicates that the S2R800 calipers, with their strange mounting brackets, are 10mm closer to the rotor than gold-lines. A gold-line caliper would not mount up to zero-offset 30mm rotor. It would come up 10mm short. So, with any normal fork, say an S2R1000 fork, or even a 748 SBK fork, the calipers would still mount up perfectly so long as the 300mm rotor with no offset is still in use. BUT, because the 999 FORKS have 5mm more offset (which i BELIEVE means it pulls the calipers 5mm further from the rotor), there is 5mm of space that needs filled.

So in actuality, when using an S2R Wheel, Rotors and Calipers, the spacing measurement really has nothing at all to do with the rotor offset of the 999, but rather the FORK offset.

Anyway, my brakes work.